In the DLP monitor under Tools -> Options
What happens when you check the WCF connection?
I also had this problem, try it in IE, was not working with me in Firefox.
Tristan and Minion,
Thanks for your responses. I was able to get to the Policy area after checking "Compatibility" mode in IE on the server. The management WS still displays the same issues, both in IE and Chrome, but at least I am able to get to the policy area at all.
I haven't checked into whether there was an IE update in the last few weeks, but that is my only guess at the moment as far as to why access suddenly stopped working through regular means.
Anyway, my solution is to use Compatibility Mode, at least in IE10, and I am still researching what to set in IE8 or 9, or Chrome, on the WS in order to regain access. The error message seen above is what really threw me off. It is anything but obvious that the inability to access the policy area is due to an IE issue.